No chance to get a larger amount in my experience (except you contact the maintainers I guess).
Mutinynet has a great faucet, but you need a fork of core.
Please lmk if you find a more reliable sbtc source than those two horrible faucets😆
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Use these scripts with your Bitcoin Core on signet: 
Delivers full coins in a few blocks.
GitHub
GitHub - ajtowns/powcoins: Obtain signet coins via proof-of-work
Obtain signet coins via proof-of-work. Contribute to ajtowns/powcoins development by creating an account on GitHub.
The whole point of testnets is that any amount is equivalent. There’s no reason to ever want a whole or event 1/10th a coin.